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Matrix Converter - Patent 7460377


The present invention relates to the field of high phase order generator equipment with power electronics. The present invention in particular relates to a matrix converter for theconversion of electrical power, which is typically connected to a generator for conversion of generated polyphase alternating current from the generator into a polyphase alternating current adapted to the grid.BACKGROUNDIn power generation, at a specified output, an increase of the rotary speed of a turbine is associated with a decrease in size and costs. Efficiency, too, can be improved. So far, power generation turbines up to 70 MW are connected togenerators by way of gearing arrangements, so as to allow operation at higher turbine rotary speeds. As the output increases, the use of gearing arrangements becomes increasingly difficult due to reliability reasons. In such cases, the turbine isoperated at synchronous speed.The use of static frequency converters (power electronics) represents an alternative providing many advantages such as reduced costs of the generator in agreement with a constant product of volume and rotational speed, standardized generators forboth 50 and 60 Hz, adjustable speed which allows restoration of the partial-load efficiency of the turbine, substantial reduction in noise, clean (oil-free) cooling, etc.Both in the case of power generation and in the case of drives, a reduction in losses of the static frequency converters would bring about substantial cost savings. A reduction of the losses would above all have a bearing on investment costsbecause cooling accounts for a substantial part of the total costs of the converter.Static frequency converters exist both with indirect AC/DC/AC conversion and with direct AC/AC conversion.The indirect conversion (AC/DC/AC) is caused by generating a direct current or a directed direct voltage from the three-phase source (mains in the case of motors; generator in the case of power generation). Subsequently, the direct curr

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